Final answer:
On the first day of filming 'Titanic', Kate Winslet flashed Leonardo DiCaprio in order to break the ice, leading to a comfortable working relationship and strong on-screen chemistry between them.
Step-by-step explanation:
To break the ice with Leonardo DiCaprio on the first day of filming, Kate Winslet took a bold and rather unconventional approach.
According to both actors and anecdotes from the set, the correct answer is C. She flashed him. This surprising act helped create a comfortable working relationship between the two, which was crucial given the intimate nature of their characters' relationship in the film 'Titanic'. Winslet's boldness and the ensuing camaraderie undoubtedly contributed to the on-screen chemistry that audiences felt so powerfully.